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Author Topic: Overtone Layout  (Read 81683 times)
max
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« Reply #15 on: March 04, 2008, 05:01:52 AM »
Quote from: ChrisL on January 25, 2008, 12:28:34 AM
No, that is the amps component layout.  There is no manual but the folks here can help you if you have any specific questions.  The controls are labeled on the layout and the amp faceplate pretty much resembles any Dumble ODS control panel.  There are plenty of pics on the www.  As for the 3 internal trimmers......2 of them I wouldn't bother adjusting and the OD trimmer is set to taste. 

Warning!!
Be very aware that there are voltages that can KILL you in there so DO NOT go poking around unless you are absolutely sure you know what you're doing.   

Which is the OD Trimmer- Embarrassed
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ChrisL
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« Reply #16 on: March 04, 2008, 05:52:00 AM »
It's the 100k trim pot at the input of V2.
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max
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« Reply #17 on: March 04, 2008, 09:56:42 AM »
Quote from: ChrisL on March 04, 2008, 05:52:00 AM
It's the 100k trim pot at the input of V2.

V2 is the center tube-correct Grin Undecided
And thanks Chris.
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« Reply #18 on: March 04, 2008, 11:33:17 AM »
Quote from: wbfree on March 04, 2008, 09:56:42 AM
Quote from: ChrisL on March 04, 2008, 05:52:00 AM
It's the 100k trim pot at the input of V2.

V2 is the center tube-correct Grin Undecided
And thanks Chris.


Yes, the center preamp tube.
 Smiley
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max
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« Reply #19 on: March 04, 2008, 05:36:32 PM »
I learn slowly, Interested in how you guys tweak it too, but only the good tweaks Smiley
Thx
Burnie Cool
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Mark From Hawaii
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« Reply #20 on: March 05, 2008, 12:14:56 AM »
I found a data sheet on the NTE452 JFET:

http://www.nteinc.com/specs/400to499/pdf/nte452.pdf

Happy reading.  Wink
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JeffreyB
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« Reply #21 on: March 05, 2008, 02:32:58 AM »
Oh man...thanks....
but...uh....er....what the hell is it?  (and can you play any lynyrd skynyrd with it?)
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« Reply #22 on: March 05, 2008, 04:49:25 AM »
Quote from: Mark From Hawaii on March 05, 2008, 12:14:56 AM
I found a data sheet on the NTE452 JFET:

http://www.nteinc.com/specs/400to499/pdf/nte452.pdf

Happy reading.  Wink

You can tweak the bias of the FET with the 2.7K resistor from "Source." The original had an 8K there.
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« Reply #23 on: March 05, 2008, 05:39:58 AM »
Quote from: ic-racer on March 05, 2008, 04:49:25 AM
Quote from: Mark From Hawaii on March 05, 2008, 12:14:56 AM
I found a data sheet on the NTE452 JFET:

http://www.nteinc.com/specs/400to499/pdf/nte452.pdf

Happy reading.  Wink

You can tweak the bias of the FET with the 2.7K resistor from "Source." The original had an 8K there.

What does the fet input do differently than the regular input..I know Iknow :Smiley :Smiley :Smiley
But I have another question that might be more enjoyable...Have you or anyone thought about about transformers as in improving the tone of the Overtone or is that not something you guys think about.
My questions come from one who has no real electronic expertise so cut me some slack okay!! Grin Smiley
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Mark From Hawaii
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« Reply #24 on: March 06, 2008, 02:34:42 AM »
Yeah, it's hard to believe that the holy grail "model"  Lips Sealed of this vintage (80s? 90s?) actually has a Shocked solid state device in the preamp stage.  Look no further than the Boogie MkII for a Fetron device in V1 (that can be replaced with a warmer 12AX7).

When tube amps are cranked to their sweet spot, output transformers probably impart their own unique contribution to the sound coming out of the speakers.  Here's a nice article about Mercury Magnetics' OTs for Marshall original plexis and reissue plexis.  Sounds like they also make retrofit models for Fenderish amps as well.

http://www.legendarytones.com/guitouttrans.html

Mercury Magnetics:

http://www.mercurymagnetics.com/pages/mainframe.htm
« Last Edit: March 06, 2008, 02:45:03 AM by Mark From Hawaii » Logged
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jake
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« Reply #25 on: March 12, 2008, 02:32:51 AM »
Quote from: Mark From Hawaii on March 06, 2008, 02:34:42 AM
Yeah, it's hard to believe that the holy grail "model"  Lips Sealed of this vintage (80s? 90s?) actually has a Shocked solid state device in the preamp stage.  Look no further than the Boogie MkII for a Fetron device in V1 (that can be replaced with a warmer 12AX7).

When tube amps are cranked to their sweet spot, output transformers probably impart their own unique contribution to the sound coming out of the speakers.  Here's a nice article about Mercury Magnetics' OTs for Marshall original plexis and reissue plexis.  Sounds like they also make retrofit models for Fenderish amps as well.

http://www.legendarytones.com/guitouttrans.html

Mercury Magnetics:

http://www.mercurymagnetics.com/pages/mainframe.htm

I didn't know th MK II Boogie used a fetron but my MK I (they didn't really say that, that's just what people call them) came with one. I still have it and it was never installed. Mike Bendeneli (sp?) told me they used them when guys CRANKED the amps so far they would go so wildly microphonic you couldn't play them. The fetron isn't a tube so it isn't microphonic. At volumes most mere mortals play at a tube sounds better to most people. Larry Carlton did use the fetron on some recorded solos back in the day though.
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« Reply #26 on: March 29, 2008, 09:55:58 PM »
A note on  the overtone layout.  The original Dumble on which the overtone is based had the preamp tube sockets rotated 180 degrees. Where Nik has indicated #1, the Dumble has #6.  The hookup is nearly identical either way.
« Last Edit: May 20, 2008, 12:15:34 AM by ic-racer » Logged
Nathan
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« Reply #27 on: May 26, 2008, 09:15:04 AM »
There is a new layout !
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Mike
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« Reply #28 on: May 27, 2008, 04:57:08 PM »
I compared the April 1 layout with the Jack Zucker modifications and the new layout per May 26, 2008.

The new layout follows all proposals of the Jack Zucker modifications (JZ mod) exept for:

1. JZ mod proposal: 2 X additional 50uF 350V parallel to the 2 X 100uF 450V
    April 1 layout: no additional caps
    May 26 layout: no additional caps (no change to old layout)
    Reason for non-adoption: not known per today

2. JZ mod proposal: 2 X 470 Ohm 5W instead of 2 X 1 KOhm 5W
    April 1 Layout: 2 X 1 KOhm 5W
    May 26 layout: no change
    Reason for non-adoption: EL34 compatibility
    ....and it was stated before that this would not really benefit sweeter
    cleans either

3. JZ mod proposal: 4.7uF 25V instead of 1uF 25V
    April 1 layout: 1uF 25V
    May 26 layout: 5uF 25V
    Reason for non-adoption: near adoption but not known per today why
    not exactly

4. JZ mod proposal: 4.7uF 25V instead of 2.2uF 25V
    April 1 layout: 2.2uF 25V
    May 26 layout: 5uF 25V
    Reason for non-adoption: near adoption but not known per today why
    not exactly

5. JZ mod proposal: 2 X 330pF instead of 2 X 220pF
    April 1 layout: 2 X 220pF
    May 26 layout: 2 X 390pF
    Reason for non-adoption: not known per today

Maybe someone (for example ampkits  Wink) could shed a light on points 1. and 5 ?
« Last Edit: May 27, 2008, 05:01:19 PM by Mike » Logged
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« Reply #29 on: June 04, 2008, 04:04:41 PM »
Hi Chris,

This is Jerry i am building 4 Overtones for Hugh Faulds. The two trimmers on the main board get left alone? thanx   Also I noticed I was sent two black an one red bias ports. The drawing shows it in reverse. Is the star ground one of the PT bolts or seperate. Pic looks seperate. Thanks for your help Can I bug you more down the road?

jerry dyer
surreal amplification
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